3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $name = 'this'; var_dump(array(&${$name}));
Output for 7.1.0 - 7.2.0
Fatal error: Uncaught Error: Cannot re-assign $this in /in/Nle7B:3 Stack trace: #0 {main} thrown in /in/Nle7B on line 3
Process exited with code 255.
Output for 4.3.0 - 7.0.20
array(1) { [0]=> &NULL }